The long-term effects of damage to your lungs (possibly lung cancer) and the possibility of giving those around you second-hand smoke.
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I believe it means that in order for someone to make you feel bad about yourself, you have to agree with what they are saying, and by agreeing you are giving them permission. Everyone has a right to their own opinion but we don't have to buy into other people's opinion of us.
The answer you r looking for is A